bunnie2d ago

One of my favorite features of the Baochip-1x is the BIO. It's an I/O coprocessor that is based on the PicoRV32, with custom register extensions to allow direct access to GPIOs from the ISA.

Read more about the BIO at this blog post: https://www.bunniestudios.com/blog/2026/bio-the-bao-i-o-coprocessor/ I go in-depth into the architecture and its trade-offs relative to the PIO, and conclude by working through a couple of coding examples.

Show threadwaldi

@bunnie Thank you for another data point why all hardware for the last decades also include "general" purpose cpus. it is just always smaller in terms of chip size.

(Related to the FSF stance that firmware in flash is good, firmware loaded from the host os is bad.)

Mar 21 at 6:50amWeb